当用户从设计器上下文菜单中选择菜单项时，系统将调用该自定义处理程序，以执行与该菜单项关联的谓词。

When a user selects a menu item from a designer context menu, the custom handler is called to execute the verb associated with the menu item.

youdao

当用户从设计器上下文菜单中选择菜单项时，系统将调用该自定义处理程序，以执行与该菜单项关联的谓词。

When a user selects a menu item from a designer context menu, the custom handler is called to execute the verb associated with the menu item.

youdao